I used the link on the RC51 with both the 180/55 & the 190/55. The Link works equally well with either size tire you just have to set the rear ride height to compensate accordingly. For that you have to have a shock with an adjustable clevis and it needs to be properly sprung so that your sag numbers are correct. Otherwise the geometry of the bike gets far enough out that you will have problems with the bike holding a proper line or trying to fight you as you tip it into the turn.
The link btw is designed to control the rising rate of the swingarm. It makes it all more linear. The added ride height is just a bonus, not the reason we use the link.
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The problem with the 190/50 is that it just steers like a turd. Even if you are just running a bone stock RC51, just swapping from a 190/50 to a 180/55 tire on the rear makes the bike feel 50lbs lighter and reduces the effort required to ride it quickly.
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